Fatigue damage prediction of short edge crack under various load: Direct Optimized Probabilistic Calculation

0479764 - ÚFM 2018 RIV NL eng C - Conference Paper (international conference)
Krejsa, M. - Seitl, Stanislav - Brožovský, J. - Lehnert, P.
Fatigue damage prediction of short edge crack under various load: Direct Optimized Probabilistic Calculation.
2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal. Amsterdam: Elsevier, 2017 - (Moreina, P.; Tavares, P.; Freitas, M.), s. 1283-1290. Procedia Structural Integrity, Vol. 5. ISSN 2452-3216.
[ICSI 2017 - International Conference on Structural Integrity /2./. Funchal, Madeira (PT), 04.09.2017-07.09.2017]
R&D Projects: GA ČR GA17-01589S
Institutional support: RVO:68081723
Keywords : fatigue * crack propagation * calibration function
OECD category: Audio engineering, reliability analysis

Fatigue crack propagation depends on a number and value of stress range cycles. This is a time factor in the course of reliability for the entire designed service life. Three sizes are important for the characteristics of the propagation of fatigue cracks - initial size, detectable size and acceptable size. The theoretical model of a fatigue crack progression can be based on a linear elastic fracture mechanics (uses Paris-Erdogan law). Depending on location of an initial crack, the crack may propagate in structural element (e.g. from the edge or from the surface under various load) that could be described by calibration functions. When determining the required degree of reliability, it is possible to specify the time of the first inspection of the construction which will focus on the fatigue damage. Using a conditional probability and Bayesian approach, times for subsequent inspections can be determined based on the results of the previous inspection. For probabilistic modelling of a fatigue crack progression was used the original and a new probabilistic method - the Direct Optimized Probabilistic Calculation ('DOProC'), which uses a purely numerical approach without any simulation techniques or approximation approach based on optimized numerical integration. Compared to conventional simulation techniques is characterized by greater accuracy and efficiency of the computation.
Permanent Link: http://hdl.handle.net/11104/0275705